and Gyrinidae of Australasia. 403 



Ovate, broad, covered throughout with small closely arranged punc- 

 tures, much more minute than in the European species P. Hermanni, of 

 a flavous or rufo-flavous colour: head very finely punctate, black: thorax 

 broadly transverse, larger than and not so constricted in front as P. 

 Hermanni ; the surface is subdepressed at the base : elytra broad, finely 

 punctate throughout ; under a high power, traces may be seen of three 

 stria-like lines of paler flavous colour : abdomen and underside black : 

 legs and antennce flavous. 



P. Australasias is somewhat larger than the common European 

 representative of this genus ; the thorax is broader, the punctures 

 more minute, and the colour uniformly and much paler : the species 

 apparently is not uncommon in the neighbourhood of Adelaide. In 

 the collections of the British Museum, of Mr. Bakewell, Mr. "Water- 

 house, and the Rev. H. Clark. 



2. P. niger, n. sp. 



P. niger, statura minore, elytris confertim punctatis, antennis pedibusque 

 flavis. 



Long. corp. 4 lin., lat. 2 lin. 



Oval, broad, considerably smaller than P. Australasice ; the surface 

 throughout is covered with thickly disposed punctures, the colour 

 black : head somewhat more sparingly punctate and glabrous : thorax 

 broadly transverse, the base being transversely subdepressed : elytra 

 broad, somewhat flattened in form ; the surface (as that of the thorax) 

 is thickly punctate throughout, more closely and coarsely than in P. 

 Australasice : abdomen and underside black : legs and antennce rufo- 

 flavous. 



From the district of Moreton Bay. In the cabinet of Mr. Bakewell. 



Tribe III. HYDEOPOEiDiE. 

 Genus 1. Hyphydktjs, 111. 

 1. H. humeralis, n. sp. 

 H. ovatus, brevis, crassus, subpubescens, punctatus, niger ; capite flavo- 

 rufo, ad basin nigro maculato ; thorace nigro, ad latera flavo ; elytris 

 nigris, ad humeros usque ad suturam et ad latera plus minus flavis, 

 apice fusco ; pedibus antennisque rufo-testaceis. 

 Long. corp. 4 lin., lat. 1| lin. 



Broad, subglobular, somewhat depressed, subpubescent, punctate, 

 black : head broad, with two obliquely transverse depressions, one on 

 either side ; at the inner margin of the eyes the surface is finely and 

 thickly punctate, more distinctly near the base ; in colour flavo-rufous, 

 with two basal triangular fuscous markings : thorax broad, much con- 

 stricted towards the front, the anterior margin is slightly excavated, 

 the surface thickly and somewhat coarsely punctate ; in colour black, 



